Question

Strontium 38Sr90 has a half-life of 29.1
yrs.It is chemically similar to calcium, enters the body through
thefood chain, and collects in the bones.
Consequently,38Sr90 is a particularly serious
healthhazard. How long (in years) will it take for 99.9796% of
the38Sr90 released in a nuclear reactor
accidentto disappear?